package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author: zhaoxinlei
 * @Date: 2025/3/30 9:59
 */
@Service
@Slf4j
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
    //微信服务接口地址
    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());

        //2、判断openid是否为空，如果为空，说明登录失败,说明这个用户已经登录过->openid不为空,抛出业务异常
        if (openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //3.判断当前是否为新用户
        User user = userMapper.getByOPenid(openid);
        //4、如果是新用户，需要自动注册
        if (user==null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        //5、自动注册成功后，再根据openid查询用户信息，返回给前端,即返回这个微信用户
        return user;
    }

    /**
     * 调用微信接口服务来去获取openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        Map<String, String> map= new HashMap<>();
        map.put("appid", "wxe4700d4f73358a4d");
        map.put("secret", "d21186bac312bf93690c24fac018037a");
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
